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ASPECTS OF THE ECOLOGY OF APPLE LEAF ROLLERS (LEPIDOPTERA: TORTRICIDAE) IN THE OKANAGAN VALLEY, BRITISH COLUMBIA

Published online by Cambridge University Press:  31 May 2012

D. F. Mayer  and
B. P. Beirne
D. F. Mayer
Affiliation:
Pestology Centre, Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia
B. P. Beirne
Affiliation:
Pestology Centre, Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia
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Abstract

Populations of leaf rollers on apple can be influenced by the proximity of alternative host plants, notably rose, privet, and antelope bush, in part because larval dispersal is common. Indications are that leaf roller population increases caused by parasite decreases are ultimate consequences of pesticide treatments, so that reductions in spray programs will not necessarily cause potential leaf roller pests to become actual pests. The composition of the leaf roller fauna on apple m the Okanagan Valley becomes increasingly complex as the environmental water balance is changed by cultivation and irrigation. There are indications that heavy vehicular traffic can be harmful to leaf rollers and their parasites nearby.

Type
Articles
Information
The Canadian Entomologist , Volume 106 , Issue 4 , April 1974 , pp. 349 - 352
Copyright
Copyright © Entomological Society of Canada 1974

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